Smoke-consuming furnace.



UNITED sTArEgsgi-ArENT OFFICE. A

HARRY A. JACKSON, OF LYNN, AND FREDERICK` W. ROBERTS, OF BOSTON, MASSACHUSETTS, ASSIGNORS TO ROBERT L. WALKER FURNACE COMPANY7 OF BOSTON, MASSACHUSETTS,

A CORPORATION or! MAINE.

SMOKE-CONSUMING FURNACE.

Specification of Letters Patent.' Y

' Patented Dec. 1, 1908.

Application mea January 22, i908. serial No. 412,209.

To atl whom fit 'may concern: j

Be it known that we, HARRY A. JACKSON, a resident of Lynn, in the countyV of Essex and State of Massachusetts, and FREDERiCK IV. ROBERTS, a resident of Boston, county of Sufolk, and State of Massachusetts, citizens of the United States, have invented certain new and useful Improvements Relating to Sinoke-Consuming Furnaces, of which the following is a specification, taken in connec-` tion with the accompanying drawing, forming part of the same. V

This invention relates to smoke-consuming furnaces and relates especially to furnaces for locomotive boilers having a divided lireboX and pivoted damper so as to effect the consumption or suppression of smoke asl described in the patent to Walker, 821,628, May 22, 1906.

In the accompanying drawings showing an illustrative embodiment of this invention, and in which theV same referencenumeral refers to` similar' parts in the several figures, Figure l-.is a longitudinal vertical section through the furnace; and Fig. 2 is a similar section on a larger scale showing'the details of the trunnion boX and mounting.

In the illustrative embodiment of this invention shown in the drawings, the locoinotive boilerinay' be constructed in the usual way and provided with the regular lire tubes 2 leading from the fire-box to the smoke-box 3 communicating with the stack 125. The

fire-box, which may be provided with the.

grate bars of usual construction, may be divided at its lower rear portion by a water leg 5 so as to forin a smoke passage or throat 1 around the front of this water leg beneath the combustion arch 4 of rebrick or other suitable material. A circulation of water is maintained through the water leg through suitable inlet-s and outlets, such as the inlet 107 and the outlet 108 leading into the thrust bearing or saddle 22 secured upon the water leg, the outlet 108 connecting with the pipe 23 leading into the boiler.

The pivoted damper 7 may be mounted above lthe water-,leg in 'any .desired way so-4 -as to properly close the opening behind the combustion arch on either side of the lirebox when swung down into horizontal position on that side. This damper 7 indicated in its vertical or middle position lmay be provided with a suitable zigzag damper 'pas-` sage 8 through the same around the various ribs 9. The pivot or forward trunnion 21 of the damper ts into a seat 115 in the thrust bearing 22 and this hollow pivot allows water from the pipe 24 to enter the damper passage and circulate through the same so as to keep the damper cool. j

If desired, the water may be positively `fed through the damper passage by the use of a circulating pump 27 mounted upon the support 103 secured to the stay plate 102 by the rivets 104. This pump may be supplied by steam through the following connection 28 so as to take water from the valved intake 30 and discharge the same through the pipe 26 andy injector nozzle 31 in the injector 25 which as indicated may be formed with a series of inlet holes adjacent the nozzle. lIn this way the water issuing from the injector nozzle 31 draws in an additional quantity of water from the water space of the boiler by the injector action and forces the same through the pipe 24 and connected damper passage.

VThe trunnion 10 on the rear of the damper may be mounted in a suitable trunnion box 132 supported in therear water face 130 of the boiler, this trunnion boX being, of course, rigidly held in position" by the stay bolts 131, or otherwise. As indicated in Fig. 2, this trunnion box may be provided with a groove or annular passage 137 with which the discharge passage 139 of the damper communicates in any operative position of the' damper.

Any desired number of radial discharge holes 138 may be formed in the trunnion box so that the water from the damper pasvsagemay be discharged into the rear water face.

Any desired means may be employed to secure steam tight joints between the damper trunnion 'and box, and if desired suitable metallic packing may be employed such as the corrugated steel packing 134. This pack- `ing may be held in operative position by the gland '133 held down in any desired way. Similar packing 135 may be held in place by the rear gland 136on the rear or outside of the rear water face andboth these glands 'maybe heldin position by a single set' of tightening or fasteningV bolts '140. The heads 141, of these blts'may be prevented from rotating' with respect to -the gland 133i by being seated in' corresponding polygonal apertures 111-2 in -the gland and the nuts 143 on the bolts on the outside of the water face enable this forward gland and packing to be adjusted and held in proper position. rlhe nuts 144 on these tightening bolts cooperate with the gland 13G and serve to adjust its position and the force with which it engages the metallic packing 135.

The damper may be properly held against its thrust bearing by shrinking the gear 18 on the trunnion, this gear being provided with the teeth 48 to coperate with the toothed operating rack 47. The spring 17 engages a suitable recess in the gear pinion and engages the bearing ring 1G at its rear end, this ring engaging a series of bearing cones or members l5 which run in a recess in the plate 1li. This plate as indicated may be held in any desired position by a series of bolts 32 secured to the water face so as to regulate the longitudinal thrust on the damper.

The arm 13 on the damper is connected with the chain 111 as shown in Fig. 1, this chain connecting with the stem 112 of the buffer 113 which as indicated is constantly acted on by the spiral spring 'l1-1t so as to keep the chain in tension and exert a cushioning action on the damper as it moves downward into horizontal position.

The damper may be operated by the steam cylinder 34 receiving steam through the three-way valve 13. The piston in this cylinder is connected with the rack bar 17 and if desired the movement of this rack bar may be suitably regulated by a piston working in the dash-pot t() having the valved bypass 46 between its two ends, this damper mechanism being similar in construction and operation to that shown in the lValker patent referred to and operating to swing the damper into the desired position. By the use of the trunnion box and rear bearing devices previously described in this case the damper trunnion and connecting parts project only a little way out from the rear water face into the firing space of the cab and thus cause practically no interference with the regular firing operations which is a highly important consideration in installing such smoke-consuming devices on locomotives.

Having described this invention in connection with an illustrative embodiment thereof, to the details of which disclosure the invention is not, of course, to be limited, what is claimed as new and what is desired to be secured by Letters Patent is set fort-h in the appended claims.

l. In a locomotive furnace, a lire-box provided with a grate, a water leg to divide said lire-box into compartments, a swinging damper mounted above said water leg to close the top of one of said compartments while allowing` gases to discharge from such compartment through the throat around said water leg at the front of said lire-box. said damper having a pivot engagii'ig a thrust bearing secured to said water leg and having a zigzag damper passage eomniunieating with said pivot and thrust bearing and having a trunnion passing through the rear water face of the boiler, a trunnion box provided with a groove and discharge holes and mounted in said vater face to receive said trunnion,there being a curved discharge passage in said trunnion communieating with said groove and with said damper passage to discharge water therefrom into said water face, corrugated metallic packing mounted in said trunnion box on either side of said water face, a front gland cooperating with said packing on the inside of said water face, a rear gland (,:operating with the packing on the outside of said water face, fastening bolts having heads engaging said front gland and prevented from rotating with respect thereto, fastening nuts on said bolts on the outside of said trunnion box to tighten said front gland from the outside of said. water face and outer nuts on said fastening bolts to tighten said rear g and and pat-king. means to hold said trunnion and damper against said thrust bearing and mans to feed water through said damper passage.

In a locomotive furnace, a lire-box provided with a grate, a water leg to divide said lire-box into compartn'ients, a swinging damper havii'ig a damper passage communieating with its front pivot and a communieating discharge passage in the damper trunnion, a trunnion box mounted in the rear water face of the boiler and provided with discharge holes and a communicating groove to cooperate with said discharge passage in said damper, packing, and packing glands around said trunnion on both sides of said water face, fastening bolts engaging said glands to tighten the same from the outside of said water face and means to supply water to said damper pass ge.

3. In a locomotive furnace, a tire-box having mounted therein a swinging damper provided with a damper passage and a communicating discharge passage in the damper trunnion, a trunnion box mounted in the rear water face of the boiler and having discharge apertures tanmnunieating with said discharge passage, packing means in said trunnion box on both sides of the same, and means to tighten said packing means from the outside of said *ater face.

4. In a locomotive furnace, a lire-box, a swinging damper in said tire-box and provided with a damper passage and a discharge passage located in the damper trunnion and connnunicating with said damper passage, a trunnion box mounted in a water face of the boiler and provided with discharge apertures "um n t a i ltlt) communicating with said discharge passage, packing means in said trunnion box and means'to supply Water to said damper passage.

5. In a locomotive furnace, a fire-box provided with a grate, a movable damper in said fire-box and provided with a damper passage and communicating discharge passage lo-` cated in the damper trunnion, a trunnion box mounted in a Water faceof the boiler and provided with a discharge aperture communicating with said discharge passage and discharging into said Water face and means to supply Water to said damper passage.

G. In a locomotive furnace, a fire-box provided With a grate, a Water leg to divide said lire-box into compartments, a swinging damper mounted above said Water leg to close the top of one `of said compartments While leaving a throat around said Water leg at the front of said lire-box, said damper having a damper passage and a communicating discharge passage located in the trunnion of said damper, a trunnion box mount.

ed in a Water :tace of the boiler and provided With a discharge aperture to cooperate with said discharge passage and means to operate said damper.

7. In a locomotive furnace, a lire-box provided with a grate, a Water leg to divide said lire-box into compartments, a swinging damper mounted above said Water leg to close the top of one of said compartments While lea-ving a throat around said Water leg at the front of said fire-box, said damper having a damper passage and a communicating discharge passage located in the trunnion of said damper, a trunnion box mounted in a Water face of the boiler and provided With a discharge aperture to cooperate With said discharge passage and means to operate said damper cooperating with said trunnion bcyond said trunnion box.

HARRY A. JACKSON. FREDERICK W. ROBERTS. 1Witnesses CnAs. C. BUGKNAM, MALCOLM GREEN. 

